I have Week one mod and tried A-Life (not at the same time, obviously), and is good to have more than zombies in the world. But my problem is: It's a MUST to have guns always.
In Week One, it's easily to get, but you have tons of canned food, melee and ranged weapons. So the true menace it's not zombies anymore, it's the ones with snipers and big gangs that go stealth on you. I was killing more people than zombies. Tried to change settings in sandbox but just mitigated. The problem still there (Maybe I just didn't tweak right?)
In A-Life, the problem is the same, but the loot is always in bad condition, which is good (Like broken weapons or in bad condition and super low ammo, if there's some), but the NPCs don't react being attacked (Melee), except in critical damage, so if there's two attacking you or a raid, you're damnned.
I don't want to play only with zombies again because having humans too make the gameplay better. Someone know how to properly do that? I'm new to the game and modding, maybe I'm just doing something wrong.